Question about Goldstar MV-1515 Microwave Oven

1 Answer

Microwave has no power

My wife operated the oven with nothing in it. it now has no power. the panel has no life to it at all. do you have any suggestions as to its problem?

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  • kbmiller Aug 21, 2008

    the brand is goldstar and the model number is MV1515B

  • William Miller
    William Miller May 11, 2010

    Most likely the magnetron overheated and tripped the magnetron's thermostat or thermal cutout (TCO), depending on which it has.

    It's likely that when that is replaced, it will be fixed, as long as the magnetron is not damaged.

    Please reply back with your brand and model number so we can help you.



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  • Goldstar Master
  • 9,042 Answers

I'd say the thermostat and/or fuse are blown. I just hope the magnetron survived.

I don't have that exact model's service manual but ones before and after only used one thermostat, similar to the drawing below.

They also have a fuse, usually located in an inline fuse holder connected to the power cord inside.

For Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit here.

Goldstar owner's manuals can be downloaded here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

microwave has no power - 32e10ec.jpg

Posted on Aug 21, 2008

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Posted on Jan 02, 2017

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1 Answer

My over the stove microwave starts continues for a few econds the f-7 appears and it stops


F7 means power to magnetron is interrupted.

I don't recommend that someone without experience and an understanding of the safety procedures undertake troubleshooting this.
You can find manuals and helpful exploded view diagrams for your model here and my favorite parts supplier is here. There is a technical sheet hidden behind the controls that has helpful technical and troubleshooting information. It will say something like this:

F7 Power to magnetron interrupted

1. Unplug microwave oven or disconnect power.
2. After 40 seconds, check to see whether this solves the problem.
3. Unplug microwave oven or disconnect power.
4. Check cooling fan operation
5. Check the magnetron.
6. Check P65 connection on the relay control board.
7. Check the P56/P66 connection between relay board and relay control board.
8. Check wiring to the 1200W inverter and control system. See "Checking Inverters."
9. Check operation of all interlock switches.
10. Replace all parts and panels before operating.
11. Plug in microwave oven or reconnect power.
12. Check voltage at 4903-1 on relay board. If it is 120, unplug microwave oven or disconnect power.
13. Replace inverter.
14. Replace all parts and panels before operating.
15. Plug in microwave oven or reconnect power.
16. If problem persists, unplug microwave oven or disconnect power.
17. Replace relay control board.
18. Replace all parts and panels before operating.
19. Plug in microwave oven or reconnect power.
20. If problem persists, unplug microwave oven or disconnect power.
21. Check for reversed plug connection on controls or loose wiring.
22. Replace all parts and panels before operating.
23. Plug in microwave oven or reconnect power.

William E. Miller, AS-EET
http://www.MicrowaveControl.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"

Oct 05, 2016 | Kenmore Microwave Ovens

2 Answers

Serial number 112Km00462. If overheated and power goes off .....is it safe to use when power comes back on?


The magnetron thermal protector probably shut the oven down. Magnetrons don't like it when their load impedance is too low (empty oven or popcorn) and they get quite warm. Operating an oven empty also shortens the life of the magnetron.

Aug 01, 2016 | In Microwave Ovens

1 Answer

F7 code on Whirlpool Microwave model GH9185XLT - 1


Power to magnetron
interrupted
12. Replace inverter.
13. Replace all parts and panels before operating.
14. Plug in microwave oven or reconnect power.
15. If problem persists, unplug microwave oven or disconnect power.
16. Replace electronic control.
17. Replace all parts and panels before operating.
18. Plug in microwave oven or reconnect power.
19. If problem persists, unplug microwave oven or disconnect power.
20. Check for reversed plug connection on controls or loose wiring.
21. Replace all parts and panels before operating.
22. Plug in microwave oven or reconnect power.

May 23, 2017 | Whirlpool GH9185XL Microwave Oven

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Works for approx 30 secs then it cuts off with a error Code F7 message.


Assuming yours is a model KHMS2050SSS0, here is what the technical sheet says about the F7 error code:

1. Unplug microwave oven or disconnect power.
2. After 40 seconds, check to see whether this solves the problem.
3. Unplug microwave oven or disconnect power.
4. Check cooling fan operation
5. Check the magnetron.
6. Check P65 connection on the relay control board.
7. Check the P56/P66 connection between relay board and relay control board.
8. Check wiring to the 1200W inverter and control system. See “Checking Inverters.”
9. Check operation of all interlock switches.
10. Replace all parts and panels before operating.
11. Plug in microwave oven or reconnect power.
12. Check voltage at 4903-1 on relay board. If it is 120, unplug microwave oven or disconnect power.
13. Replace inverter.
14. Replace all parts and panels before operating.
15. Plug in microwave oven or reconnect power.
16. If problem persists, unplug microwave oven or disconnect power.
17. Replace relay control board.
18. Replace all parts and panels before operating.
19. Plug in microwave oven or reconnect power.
20. If problem persists, unplug microwave oven or disconnect power.
21. Check for reversed plug connection on controls or loose wiring.
22. Replace all parts and panels before operating.
23. Plug in microwave oven or reconnect power.

(This troubleshooting guide presumes one does not know how to test electronic components. That's why they say to replace and part and check it again.)

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

If yours is a different model number, please reply back.

May 26, 2009 | KitchenAid KHMS2050SSS Microwave Oven

1 Answer

Hi Yes I have a Whirlpool MIcrowave Oven Model # MH7140XFB-1 And It was working fine this morning I went to use it this afternoon and the panel is not working no lights work nothing the fan under neath...


check for a blown ceramic fuse behind the panel. If the fuse is dark in color it is probly bad. you can get one at radio shack store or on line

Apr 16, 2009 | Microwave Ovens

1 Answer

Whirlpool microwave oven


There should also be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

It says:

F7 Power to magnetron interrupted

1. Unplug microwave oven or disconnect power.
2. After 40 seconds, check to see whether this solves the problem.
3. Unplug microwave oven or disconnect power.
4. Check cooling fan operation
5. Check the magnetron.
6. Check P65 connection on the relay control board.
7. Check the P56/P66 connection between relay board and relay control board.
8. Check wiring to the 1200W inverter and control system. See “Checking Inverters.”
9. Check operation of all interlock switches.
10. Replace all parts and panels before operating.
11. Plug in microwave oven or reconnect power.
12. Check voltage at 4903-1 on relay board. If it is 120, unplug microwave oven or disconnect power.
13. Replace inverter.
14. Replace all parts and panels before operating.
15. Plug in microwave oven or reconnect power.
16. If problem persists, unplug microwave oven or disconnect power.
17. Replace relay control board.
18. Replace all parts and panels before operating.
19. Plug in microwave oven or reconnect power.
20. If problem persists, unplug microwave oven or disconnect power.
21. Check for reversed plug connection on controls or loose wiring.
22. Replace all parts and panels before operating.
23. Plug in microwave oven or reconnect power.

If for some reason your tech sheet is not there, you can download it here.

We regularly repair control units for customers nationwide by mail for $39.95 postpaid in about a week with a one-year guarantee.

Feel free to contact me directly (and please remind me of your full model number) for more information & help.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Nov 30, 2008 | Whirlpool GH4155XP Microwave Oven

1 Answer

Microwave F-7 Code


F7 is q Power to magnetron
interrupted

1. Unplug microwave oven or disconnect power.
2. After 40 seconds, check to see whether this solves the problem.
3. Unplug microwave oven or disconnect power.
4. Check cooling fan operation
5. Check resistance of the magnetron thermostat.
6. Check the magnetron.
7. Check P2, P4 and P27 connections.
8. Check wiring to the 1100W inverters and control system. See
“Checking Inverters.”
9. Check operation of all interlock switches.
10. Replace inverter, if defective.
11. Replace all parts and panels before operating.
12. Plug in microwave oven or reconnect power.
13. If problem persists, unplug microwave oven or disconnect power.
14. Replace electronic control.
15. Replace all parts and panels before operating.
16. Plug in microwave oven or reconnect power.
17. If problem persists, unplug microwave oven or disconnect power.
18. Check for reversed plug connection on controls or loose wiring.
19. Replace all parts and panels before operating.
20. Plug in microwave oven or reconnect power.

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Kenmore Over the Range Microwave


If you think the window is stained, you ought to see the rest of the inside! Wife is probably right. (wink, wink, nod, nod)
Actually, you can take the cover off, remove the front panel without much effort and clean everything and get a lot more life out of it. Microwaves usually die because of heat related problems caused by buildup of yuck on the guts.
Hope Ya Make your Wife Happy!

Jan 24, 2008 | Microwave Ovens

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